Apparatus for coating pipe



A. G. PERKINS APPARATUS F612 COATING PIPE Aug. 28, 1934.

Filed Bias; 8. 1951 s Sheets-Sheet 1 v B i a' Aug. 28, 17 34. A. G. PERKINS 1,971,535 I APPARATUS FQR COATING PIPE Filed Dec. 8. 1931 3 Sheets-Sheet 2 'IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII ll IIIHIIIIIIIIIIIIIHHIIIIIIIIIMIIIIIIN I! I]- I. fivenfoz Aug. 28, 1934. ,A. PERKINS APPARATUS FOR COATING PIPE 3 Sheets-Sheet 5 u e llllllllllllll II Patented Aug. 28, 1934 UNITED STATES PATENT OFFICE 13 Claims.

This invention relates to an apparatus which has been designed for applying a protective coating or lining to the inner walls of pipe lines to and effective means for delivering or discharging the coating material evenly and rapidly over the pipe wall.

Another object of the invention is to provide novel construction and hereinafter described and particularly pointed a coating or spraying apparatus having novel means for distributing the coating material centrifugally in relatively small, steady streams over the'pipe wall, and which is provided with means for agitating'the coating material to maintain it at the proper consistency as it is delivered from the discharge end of -the apparatus.

A further object is to provide a coating apparatus having means for delivering a solid .or powdered coating material to the pipe wallin conjunction with a fluid spray.

Other features of the invention reside in the arrangement of parts out in the appended claims.

In the accompanying drawings:-

Figure 1 is a side elevation of .my improved coating apparatus shown as traveling through a pipe line for treating its interior walls. Figure 2 is a front view of the apparatus arranged within the pipe. Figure 3 is an enlarged transverse section taken in the plane of line 3-3, Figure 1.

. Figure 4 is an enlarged central longitudinal sec- 1 section taken on line Similar characters of reference indicate corretion of the apparatus. Figure 5 isan enlarged fragmentary vertical section of the nozzle end of the apparatus. Figure 6 is a fragmentarylongitudinal section of a slightly modified form of the inventon. Figure 'l is a fragmentary cross 'l-'7, Figure 6.

spondingparts throughout the several views.-

While my apparatus may be employed for coating different kinds of work, it has been primarily designed for treating the inner walls of pipe lines with a protective coating, a wet or plastic-like material as concrete, or a dry material, such junction with a suitablefluid for enabling the powdered material to adhere to the pipe wall. To this end the apparatus consists generally of a carriage adapted to be propelled through the pipe line and dispensing means for applying the protective coating to the pipe wall as the carriage travels lengthwise through the pipe.

Referring now to the drawings, particularly such, for example, as

as powderedcement, incon- Figures 1-4, inclusive, 10 indicates a section of steel pipe through which my apparatus is designed to travel for treating or coating the inner wall of the pipe with a covering of concrete or like moist or plastic material. The carriage of the apparatus'may be of any appropriate construction, that shown in the drawings by way of example, consisting of a frame 11 including traction wheels 12 driven by an electric or air motor 13 connected by gearing 14, 15 with the driving shaft or axle 16 of the several traction wheels. Motion is transmitted from this driving shaft or axle to the various traction wheels by a sprocket chain 17 which passes around the sprocket wheels 18 applied to the endmost traction wheels, while its upper and lower stretches engage sprocket wheels 19 applied to the intermediate sets of traction wheels.

Surmounting ithe frame 11 is a platform 20 carrying depending posts 21 which telescopically engage corresponding tubular members 22 applied to the frame, thereby permitting adjustment of the platform diametrically of the pipe. Mounted on this platform. are the operative parts for controlling the application of the coating material to the pipe wall as the carriage travels lengthwise through the 'pipe. In the preferred construction of such parts, the samecomprise a feedhopper or receptacle 23 for receiving the material, such as concrete, employed for coating the pipe walls, this hopper being disposed near the. front end of the apparatus and having a longitudinally disposed feed conduit 24 projecting rearwardly from its bottom end and containing a screw conveyor 25 or like element for propelling the coating material such as concrete from the hopper to the rear or discharge end of the apparatus which is provided with a dispensing device or applicator for deliv-. ering the concrete in layer-like fashion onto the pipewall. The feed screw 25, which'is disposed in the bottom of the hopper cally the full length of the conduit 24, is journaled at its ends in appropriate bearings and is driven at a comparatively slow speed by an air or electric motor 27 connected by a pinion 28 with a gear wheel 29 fixed on the front end of the feed screw.

The dispensing device for centrifugally discharging the coating material onto the pipe walls preferably consists of a rotatable member or tube 30 surrounding the feed conduit 24 and revolvable about the'axis of said conduit at a high speed relative thereto and provided at its free or rear-end with a spray device or nozzle, indicated generally by the numeral 31, designed to discharge the ma and extends practidispensing device.

which permit a free revolving movement of the tubular member relative to the conduit. Outside bearings 33 applied to the platform 20 and in which the front and rear ends of the tubular member30 are journaled also serve in conjunction with the internal bearings 32 to support and maintain the feed conduit and tubular member in proper axial alinement. This tubular member may be driven in any suitable manner, as by an electric or air motor 34 through suitable gearings 35 and 36 so that the tubularmember is driven at av speed of approximately 10004200 R. P. M.

At its rear or free end, which projects a slight distance beyond the corresponding end of the feed conduit 24, the tubular member 30 is provided with a suitable closure 37, and the conduit is provided with a similar closure 38; I Forwardly of its clo; sure and immediately surrounding the rear or discharge end of the feed conduit, the tubular member 30 is provided with a plurality of dischargenozzles, jets or pipes 39which are disposed radially and in contiguous relation about the tubular member to revolve therewith. At its re'ar'end the feed conduit 24 has anannular row of discharge ports 40 which are disposed substantially radially in line with the jet pipes and through which the coating material is discharged into the opposing inlet ends of such pipes, the latter being disposed at their inner ends in proximity to the outer surface of the feed conduit. As shown in Figure 5, a suitable packing 41 is interposed between the outer wall of the feed conduit and the inner wall of the tubular member at a point for: wardly ofthe discharge ports 40 to prevent the coating material from working into the spacebetween said parts. In the event that the coating material should gain access to the annular space between the feed conduit and the tubular member, I provide openings 42 for the discharge by .ce'ntrifugal force of such surplus material before it gains access to the bearings 32.

As shown in Figure 4, the feed screw 26 projects through the plugs or closures 3'7, 38 and preferably mounted thereon is a radial arm 'or support 43 having a troweling element 43a thereon which is adapted to smooth over the film or layer of concrete after being applied to the pipe wall by the In order to keep the concrete at its proper consistency, it is kept in motion by a suitable agitator or bladed wheel 44 mounted on the feed screw and disposed within the feed conduit 24 in the vicinity of its discharge ports 40..

In the modified form of the invention shown in Figures 6 and '7, the apparatus is designed to effect the application of a dry material, such as powdered cement, to the pipe wall, such material requiring an application of a suitable fluid to the pipe wall to enable the material to stick or adhere thereto.- In this embodiment of the invention, the arrangement of the feed screw 25 and the dispensing device for discharging .the material by centrifugal force onto. the pipe wall is'identical with that of the previously described-structure. The means for applying the fluid or cement ad-'- hering solution to the pipe wall, previously to applying the powdered cement thereto, consists of one or more spray nozzles 45 applied to radial pipes 46 connected to a jacketed portion 47 which, may be formed on the revolving tube 48. Fluid is .rial The spraying nozzles 45 are disposed forwardsupplied to the Jacket 47 through a pipe 49 which is connected to a stationary distributing head or collar 50 surrounding the water jacket and having an internal groove 51 communicating with ports 52 opening into the jacket, as seen in Figure 6.

tributing collar and the contiguous wall of the revolving tube 48, packing glands 53 are screwed into the opposite ends of said collar. The fluid for causing the powdered cement to adhere to the pipe wall may be water, turpentine or like mate ly of the cement-discharging nozzles 39 so that the pipe 10 is coated with the fluid prior to receiving the protective charge of cement.- To

prevent thedust issued from the cement, as the same is discharged from its nozzle, working its 'To prevent leakage of the fluid between the disway forwardly of the machine and being de-' posited onto the pipe wall prior to its receiving the fluid coating, I provide a dust shield 54 which is of a diameter approximately equal to that of the internal diameter of the pipe and which is disposed between the cement distributing nozzles 39 and the spray heads 45. This shield is stationary and may be supported on suitable brackets 55 attached to the adjoining portions of the machine frame. As a-further means of keeping the dust from being deposited onto the pipe wall, I preferably provide the nozzle or jet pipes 39 with fins or vanes 56 which,

during the operation of the machine, tend to create-a vacuum and thereby prevent the dust from being deposited on the pipe wall.

This machine may also be advantageously employed for reconditioning water pipe lines and the like by utilizing a sand blast, the sand being directed against the pipe wall in the same man ner as the coating material.

I claim as my invention:

1. An apparatus for lining pipe walls, comprising a carriage movable lengthwise through the pipe, feed means adapted for communica= tion with a source of substantially plastic coating material and having a radial discharge, and a revolving member surrounding the discharge end of said feed means to form a chamber therewith for receiving the material from said radial discharge and including jets revolvable therewith for conducting and directing the material by centrifugal force against the pipe-walls.

2. An apparatus for lining pipe walls, c0mprising a feed conduit adapted for communication with a source of substantially plastic coating material and having discharge ports therein, means extending substantially the full length of said conduit for continuously feeding the material through said conduit 'toward its discharge ports, and a revolving nozzle applied to the discharge end of said feed conduit about its discharge ports to form a receiving chamber for the coating material and including jets radiating therefrom and communicating at their inner ends with the nozzle chamber surrounding said feed conduit, whereby the coating material is delivered centrifugally in successive small streams onto the pipe wall.

3. An apparatusfor lining pipe walls, compris ing a feed conduit adapted for communication with a source of substantially plastic coating material and having radial ports at its discharge end, means for positively feeding "the material terial and having radial ports at its discharge end,

means for continuously feeding the material through the conduit, a tubular member revolvably mounted on, said feed conduit in concentric spaced relation about its discharge ports, and nozzles radiating from said member and having their inlet ends extending into the space between the feed conduit and the tubular member and in prpximity'to the discharge ports of the latter, the outlet ends of said nozzles being spaced from the pipe wall wherebythe coating material is delivered centrifugally in sucessive small streams on to the same. p

5. An apparatus for lining pipe ing a carriage movable lengthwise through the pipe, a hopper for a substantially plastic coating material mounted thereon and having a feed conduit extending therefrom, said conduit having discharge ports therein, means for continuously feeding the material toward the discharge end of the conduit, and a revolvable member disposed in spaced relation over the ported portion of said conduit toform a receiving'chamber for'receiving the material from the conduit ports, said member having Jets radiating therefrom disposed with their inlet ends in contiguous communicating re? lation with said discharge ports, theoutlet ends of said jets being spaced from the pipe wall, whereby the coating material is directed by centrifugal force and in successive small streams onto the pipe wall.

6. An apparatus for lining'pipe walls, comprising a feed conduit adapted for communication with a source of coating material and having discharge ports therein, means for forcing the coat-- ing' material through said conduit and itsdischarge ports, a revolving nozzle in communication with said discharge ports, and means arranged in the feed conduit and forwardly of said forcing means for agitating the coating material in the vicinity of said dischar e ports.

'1. An apparatus-for lining pipe walls, comprising a feed conduit adapted for communication with a source of substantially plastic coating material and having discharge ports thereon, a feed screw for forcing the coating material through said conduit and its discharge ports, a revolving nozzle in communication with said discharge ports, and an agitating element arranged in the feed conduit adjacent to the discharge ports thereof.

8. An apparatus for lining pipe walls, comprising a feed conduit adapted for communication walls, compriswith a source of coating material and having discharge ports therein, a feed screw for forcing the coating material through said conduit and its discharge ports, a revolving nozzle in communication with said discharge ports, an agitating element arranged in the feed conduit adjacent to the discharge ports thereof, and means for troweling the material after it has been deposited on the pipe wall.

9. An apparatus for ing a revolving nozzle adapted for conmiunication with asource of coating material, means disposed at one side of said nozzle for delivering adhesive material on the pipe wall in advance of said coating material, and a baflie disposed between said nozzle and said adhesive-delivery means.

10. Anapparatus for lining pipe walls, comprising a carriage movable lengthwise through the pipe, a feed conduit mounted thereon in communication with a source of coating material, a chamber for receiving a fluid adhesive material, longitudinally-spaced revolvable nozzles in separate communication with said feed conduit and said chamber for applying said materials to the pipe wall in different planes and in succession one over the. other, and a circular bame plate mounted on said carriage in a plane between said nozzles, respectively.

11. An apparatus for lining pipe walls, comprising a feed conduit'adapted for communica-,,

tion with a source of coating material and having discharge ports therein, means for forcing the coating material through said conduit and its discharge ports, and a revolving'tubular member disposed in spaced concentric relation about the feed tube and having nozzles-radiating therefrom, the inlet ends of said nozzles being in communi'. cation with the feed conduit discharge ports, said tubular member having outlets therein for the centrifugal discharge of any surplus coating material.

12'. An apparatus for lining pipe walls, comprising a feed conduit adapted for communication with a source of coating material and having discharge ports therein, a revolving nozzle applied to the discharge end of said feed conduit and including jet pipes radiatingv therefrom, the inner ends of said jet pipes being disposed in communicating relation with the discharge ports of said feed conduit, and vanes applied to the outer portions of said jet pipes.

lining pipe walls, compris- 13. An apparatus for lining pipe walls, comprising a feed conduit for a substantially plastic coating material having a discharge, means for feeding the material through said conduit toward its discharge end, and a revolving member encircling the discharge. end of said conduit to form 

